Whenever I purchase a movie or tv show from iTunes I like to move it to an external drive and use Quicktime X to play the video. Up until now it's worked great but recently a large portion of my purchased video content won't play... Quicktime X loads up but it just sits at a black screen and the play button does nothing.

The videos DO still work in Quicktime 7 but I'd like to use X like I've been doing. Anyone know what might of happened?